Apart from bonus and service conditions, what other issues were raised by the Railway strike of May 1974?

Rights of the workers and the appropriateness of strikes in essential services

Answer: Rights of the workers and the appropriateness of strikes in essential services.
The strike raised issues like the rights of the workers and whether employees of essential services should adopt measures like strikes.

The National Coordination Committee for Railwaymen’s Struggle led by George Fernandes gave a call for nationwide strike by all employees of the Railways for pressing their demands related to bonus and service conditions. The government was opposed to these demands. So, the employees of India’s largest public sector undertaking went on a strike in May 1974. The strike by the Railway employees added to the atmosphere of labour unrest. It also raised issues like rights of the workers and whether employees of essential services should adopt measures like strikes. The government declared the strike illegal. As the government refused to concede the demands of the striking workers, arrested many of their leaders and deployed the territorial army to protect railway tracks, the strike had to be called off after twenty days without any settlement.